/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * tools/mksymtab.c
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "csvparser.h"

/****************************************************************************
 * Definitions
 ****************************************************************************/

#define MAX_HEADER_FILES 500
#define SYMTAB_NAME      "g_symtab"

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

static const char *g_hdrfiles[MAX_HEADER_FILES];
static int nhdrfiles;

/****************************************************************************
 * Private Functions
 ****************************************************************************/

static void show_usage(const char *progname)
{
	fprintf(stderr, "USAGE: %s <cvs-file> <symtab-file>\n\n", progname);
	fprintf(stderr, "Where:\n\n");
	fprintf(stderr, "  <cvs-file>   : The path to the input CSV file\n");
	fprintf(stderr, "  <symtab-file>: The path to the output symbol table file\n");
	fprintf(stderr, "  -d           : Enable debug output\n");
	exit(EXIT_FAILURE);
}

static bool check_hdrfile(const char *hdrfile)
{
	int i;

	for (i = 0; i < nhdrfiles; i++) {
		if (strcmp(g_hdrfiles[i], hdrfile) == 0)
			return true;
	}

	return false;
}

static void add_hdrfile(const char *hdrfile)
{
	if (hdrfile && strlen(hdrfile) > 0) {
		if (!check_hdrfile(hdrfile)) {
			if (nhdrfiles > MAX_HEADER_FILES) {
				fprintf(stderr, "ERROR:  Too man header files.  Increase MAX_HEADER_FILES\n");
				exit(EXIT_FAILURE);
			}

			g_hdrfiles[nhdrfiles] = strdup(hdrfile);
			nhdrfiles++;
		}
	}
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

int main(int argc, char **argv, char **envp)
{
	char *csvpath;
	char *symtab;
	char *nextterm;
	char *finalterm;
	char *ptr;
	bool cond;
	FILE *instream;
	FILE *outstream;
	int ch;
	int i;

	/* Parse command line options */

	g_debug = false;

	while ((ch = getopt(argc, argv, ":d")) > 0) {
		switch (ch) {
		case 'd':
			g_debug = true;
			break;

		case '?':
			fprintf(stderr, "Unrecognized option: %c\n", optopt);
			show_usage(argv[0]);

		case ':':
			fprintf(stderr, "Missing option argument, option: %c\n", optopt);
			show_usage(argv[0]);

		default:
			fprintf(stderr, "Unexpected option: %c\n", ch);
			show_usage(argv[0]);
		}
	}

	if (optind >= argc) {
		fprintf(stderr, "Missing <cvs-file> and <symtab-file>\n");
		show_usage(argv[0]);
	}

	csvpath = argv[optind];
	optind++;

	if (optind >= argc) {
		fprintf(stderr, "Missing <symtab-file>\n");
		show_usage(argv[0]);
	}

	symtab = argv[optind];
	optind++;

	if (optind < argc) {
		fprintf(stderr, "Unexpected garbage at the end of the line\n");
		show_usage(argv[0]);
	}

	/* Open the CSV file for reading */

	instream = fopen(csvpath, "r");
	if (!instream) {
		fprintf(stderr, "open %s failed: %s\n", csvpath, strerror(errno));
		exit(EXIT_FAILURE);
	}

	/* Open the Symbol table file for writing */

	outstream = fopen(symtab, "w");
	if (!outstream) {
		fprintf(stderr, "open %s failed: %s\n", csvpath, strerror(errno));
		exit(EXIT_FAILURE);
	}

	/* Get all of the header files that we need to include */

	while ((ptr = read_line(instream)) != NULL) {
		/* Parse the line from the CVS file */

		int nargs = parse_csvline(ptr);
		if (nargs < PARM1_INDEX) {
			fprintf(stderr, "Only %d arguments found: %s\n", nargs, g_line);
			exit(EXIT_FAILURE);
		}

		/* Add the header file to the list of header files we need to include */

		add_hdrfile(g_parm[HEADER_INDEX]);
	}

	/* Back to the beginning */

	rewind(instream);

	/* Output up-front file boilerplate */

	fprintf(outstream, "/* %s: Auto-generated symbol table.  Do not edit */\n\n", symtab);
	fprintf(outstream, "#include <tinyara/config.h>\n");
	fprintf(outstream, "#include <tinyara/compiler.h>\n");

	/* Output all of the require header files */

	for (i = 0; i < nhdrfiles; i++)
		fprintf(outstream, "#include <%s>\n", g_hdrfiles[i]);

	/* Now the symbol table itself */

	fprintf(outstream, "\nstruct symtab_s %s[] =\n", SYMTAB_NAME);
	fprintf(outstream, "{\n");

	/* Parse each line in the CVS file */

	nextterm = "";
	finalterm = "";

	while ((ptr = read_line(instream)) != NULL) {
		/* Parse the line from the CVS file */

		int nargs = parse_csvline(ptr);
		if (nargs < PARM1_INDEX) {
			fprintf(stderr, "Only %d arguments found: %s\n", nargs, g_line);
			exit(EXIT_FAILURE);
		}

		/* Output any conditional compilation */

		cond = (g_parm[COND_INDEX] && strlen(g_parm[COND_INDEX]) > 0);
		if (cond) {
			fprintf(outstream, "%s#if %s\n", nextterm, g_parm[COND_INDEX]);
			nextterm = "";
		}

		/* Output the symbol table entry */

		fprintf(outstream, "%s  { \"%s\", (FAR const void *)%s }", nextterm, g_parm[NAME_INDEX], g_parm[NAME_INDEX]);

		if (cond) {
			nextterm = ",\n#endif\n";
			finalterm = "\n#endif\n";
		} else {
			nextterm = ",\n";
			finalterm = "\n";
		}
	}

	fprintf(outstream, "%s};\n\n", finalterm);
	fprintf(outstream, "#define NSYMBOLS (sizeof(%s) / sizeof (struct symtab_s))\n", SYMTAB_NAME);

	/* Close the CSV and symbol table files and exit */

	fclose(instream);
	fclose(outstream);
	return EXIT_SUCCESS;
}
